Good morning. With reference to the letter by MA of Rugby and his MG ZT, the airbag warning light is a common problem with ZTs and Rover 75s, caused by a loose connection underneath the either the driver of passenger seat. With the engine switched off, for safety, wait 30 minutes for any residual current to be dispersed, pull apart the yellow terminal blocks, clean with contact cleaner and re-connect. For a more permanent fix you can remove the terminal blocks and solder the wires together. An easy and inexpensive fix.